toolmaker/welder

On a different subject, can you some time go over when to use and not use DC/helium for heavy alum without preheat. I have found this an excellent way to weld thick alum with little or no preheat, but the joint needs to be cleaned really well, and use only 4043 rod.

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this is Jody chiming in...I did some DC aluminum welding a few days ago. I am waiting on a good job to use it on before I shoot a video